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Kernel: Scan ACPI memory ranges for the RSDP table

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On some systems the ACPI RSDP table may be located in ACPI reserved
memory ranges rather than in the EBDA or BIOS areas.
This commit is contained in:
Tom 2022-01-02 16:27:21 -07:00 • committed by Linus Groh
parent 190572b714
commit 10efbfb09e
3 changed files with 35 additions and 1 deletions
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23
Kernel/Firmware/ACPI/Parser.cpp
View file

@ -388,7 +388,28 @@ UNMAP_AFTER_INIT Optional<PhysicalAddress> StaticParsing::find_rsdp()
auto rsdp = map_ebda().find_chunk_starting_with(signature, 16);
if (rsdp.has_value())
return rsdp;
return map_bios().find_chunk_starting_with(signature, 16);
rsdp = map_bios().find_chunk_starting_with(signature, 16);
if (rsdp.has_value())
return rsdp;
// On some systems the RSDP may be located in ACPI NVS or reclaimable memory regions
MM.for_each_physical_memory_range([&](auto& memory_range) {
if (!(memory_range.type == Memory::PhysicalMemoryRangeType::ACPI_NVS || memory_range.type == Memory::PhysicalMemoryRangeType::ACPI_Reclaimable))
return IterationDecision::Continue;
Memory::MappedROM mapping;
mapping.region = MM.allocate_kernel_region(memory_range.start, Memory::page_round_up(memory_range.length).release_value_but_fixme_should_propagate_errors(), {}, Memory::Region::Access::Read).release_value();
mapping.offset = memory_range.start.offset_in_page();
mapping.size = memory_range.length;
mapping.paddr = memory_range.start;
rsdp = mapping.find_chunk_starting_with(signature, 16);
if (rsdp.has_value())
return IterationDecision::Break;
return IterationDecision::Continue;
});
return rsdp;
}
UNMAP_AFTER_INIT Optional<PhysicalAddress> StaticParsing::find_table(PhysicalAddress rsdp_address, StringView signature)

11
Kernel/Memory/MemoryManager.cpp
View file

@ -174,6 +174,17 @@ UNMAP_AFTER_INIT void MemoryManager::protect_ksyms_after_init()
dmesgln("Write-protected kernel symbols after init.");
}
IterationDecision MemoryManager::for_each_physical_memory_range(Function<IterationDecision(PhysicalMemoryRange const&)> callback)
{
VERIFY(!m_physical_memory_ranges.is_empty());
for (auto& current_range : m_physical_memory_ranges) {
IterationDecision decision = callback(current_range);
if (decision != IterationDecision::Continue)
return decision;
}
return IterationDecision::Continue;
}
UNMAP_AFTER_INIT void MemoryManager::register_reserved_ranges()
{
VERIFY(!m_physical_memory_ranges.is_empty());

2
Kernel/Memory/MemoryManager.h
View file

@ -237,6 +237,8 @@ public:
void copy_physical_page(PhysicalPage&, u8 page_buffer[PAGE_SIZE]);
IterationDecision for_each_physical_memory_range(Function<IterationDecision(PhysicalMemoryRange const&)>);
private:
MemoryManager();
~MemoryManager();